Roluos archeological site is located about 13 Km east of Siem Reap town. Once it was the seat of Hariharalaya, the first capital of the Khmer Empire.
• Amongst the Roluos group of temples, we find some of the earliest permanent structures built by the Khmer. They mark the beginning of the classical period of the Khmer civilization, dating from the late 9th century. Some were built completely with brick, others partially with laterite or sandstone (the first large Angkorian temple built with sandstone was possibly Ta Keo, close to Angkor Thom).
• The Roluos group is composed of 3 major temples: Bakong, Lolei, and Preah Ko, along with the tiny Prasat Prei Monti. At both Bakong and Lolei there are contemporary Buddhist monasteries.